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Thread: tooo high Fuel cosumption Please HElp HElp

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    Exclamation tooo high Fuel cosumption Please HElp HElp

    Hi all.
    I want your advice please


    Iíve 2003 vectra with z22se engine with automatic transmition
    I face a big problem with my car high fuel consumption
    The car now consumes after calculation about 15.56 MPG which equal in our units 6.5 Km/L
    Iíve made inspection with local dealer and many local Opel specialist garage and all of them told me the car have no error codes and every thing is ok
    Note (new plugs + new fuel filter + new air filter + Catalytic converter is clean)
    My drive style is very smooth and I donít use the pedal deep and my rpm average about 2 - 2.5 rpm
    Last garage have replaced the lower O2 sensor which costs about 211 $ in our country with no positive result!!!!!
    when I watch the reading from BC screen while Iím driving I notice that when my foot touch the pedal the instant average is 2.5 KM/L which equal 5.904 MPG and this happens at soft touch or deep on the pedal
    And while driving at 80 km/h (50 M/H) even the road is straight and no mountains when I touch the pedal the average will be 8-9whchequals 18.9 - 21.26 MPG
    I use 95% octane fuel
    And donít know what I can do for this problem
    I started to hate the car please help if any one have any idea





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    Default hi

    are you getting these figures off the screen or are you calculating from actual consumption + mileage?

    I'm presuming you've no leaks in the fuel system too?

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    Regular Member denzilbud's Avatar
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    Default

    isnt it the first lambda next to manicat which controls the amount of fuel

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    confused Hi mparks8590

    I used both and I my calculations and the reading is almost the same
    But what about the leakage if there are a leakage where it can be according to your experience


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    Default

    Yes the first lambda but the reading according to tech2 is normal
    They told me that the reading must be variable and start from 50 and reach 950
    And give lean / rich sequent reading
    Is this ok or not

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    Default smell it

    I'd think fuel leak is unlikely to be the cause but its a fairly quick one to exclude before moving on to more complex things

    if you had fuel leak you'd smell it as it evapourated and more than likely performance would be affected.

    have your garages checked the ertire fuel system from the filler hose to fuel tank , pumps and interlinking pipework?

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    Regular Member denzilbud's Avatar
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    Default

    is there any leaks in the exhaust system as i just recently had to replace the back box on my z22se as it had a split in and that was making my car use no end of extra fuel

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    Default

    No they have not checked the hoses and the pump
    But as you said I must smell it but there is no smell any where

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    Regular Member LADmachining's Avatar
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    Default

    Are the other sensors such as coolant temperature and mass air flow reading correctly on TECH2?

    I have seen cases before where the coolant temp sensor is telling the ECU that the engine is colder than it actually is. This gives the effect of making the ECU inject more fuel than needed. The ECU does not see an 'out-of-range' reading from the sensor, so does not flag up a fault.

    Also, is the engine reaching operating temperature within a normal period of time (i.e 1 or 2 miles)?

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    Default

    The coolant sensor temp reading is ok when tested on tech2 it gives 97 c
    air mass flow 10 on tech2
    but take more time until it reaches the normal operating temp
    more than 5 miles

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